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How to draw a mark near clicked point
Posted: Wed Jan 21, 2009 1:50 pm
by 9641771
I have a chart and line series on it. I need to draw a standart teeChart mark near clicked point and hide it after enother click. How can I do this?
Posted: Wed Jan 21, 2009 1:56 pm
by narcis
Hi bairog,
You can try using ToolTips as shown
here.
Hope this helps!
Posted: Wed Jan 21, 2009 4:19 pm
by 9641771
But I want to have multiple marks (user can click all even points for example
). Mark should hide after enother click at the SAME point. Besides I also need to be able to drag this marks. As I suppose using ToolTips doesn't allow me to drag them.
UPDATE
A had an idea and today I've tested it.
The idea was to draw a line with marks enabled at every point, then make all of them inactive while loading form(accessing them with
line1.Marks.Items[Index] property) and then activate and deactivate clicked points' marks the same way.
But there was a problem.
line1.Marks.Items.Count was ALWAYS
zero (inside line1_AfterDrawValues, teeChart1_AfterDrawSeries and
lineAct_GetSeriesMark events and everywhere in project). So I can't access definite mark at runtime.
And inside OnGetSeriesMark event I have access only to mark text and that is not enough
What I'm doing wrong and what should I do?
UPDATE
Problem solved
My idea was right and I've implemented it.
Using
Code: Select all
for (i = 0; i < lineAct.Count; i++)
lineAct.Marks.Items[i].Visible = false;
instead of
Code: Select all
foreach (Steema.TeeChart.Styles.MarksItem mark in lineAct.Marks.Items)
mark.Visible = false;
worked perfectly.
So could you explain me how could it be that lineAct.Marks.Items.Count is always zero but I can access lineAct.Marks.Items
?
Posted: Thu Jan 22, 2009 10:25 am
by narcis
Hi bairog,
So could you explain me how could it be that lineAct.Marks.Items.Count is always zero but I can access lineAct.Marks.Items,
I'm afraid this is a bug which I have added to the list (TF02013771) to be fixed for next releases.
Re: How to draw a mark near clicked point
Posted: Thu Jun 25, 2009 1:13 pm
by narcis
Hi bairog,
After investigating this issue we found this is not a bug. In Steema.TeeChart.Styles.MarksItems.this[int index]... if the index is greater than the number of present MarksItems, a new null MarksItem is added in, for example:
Code: Select all
public Form1()
{
InitializeComponent();
InitializeChart();
}
private void InitializeChart()
{
Steema.TeeChart.Styles.Bar bar1 = new Steema.TeeChart.Styles.Bar(tChart1.Chart);
bar1.FillSampleValues();
MessageBox.Show(bar1.Marks.Items.Count.ToString());
bar1.Marks.Items[2].Color = Color.Red;
MessageBox.Show(bar1.Marks.Items.Count.ToString());
}
Re: How to draw a mark near clicked point
Posted: Tue Jul 14, 2009 9:37 am
by 9641771
Narcís wrote:if the index is greater than the number of present MarksItems, a new null MarksItem is added in
We are talking about different things. I mean that:
Code: Select all
public Form1()
{
InitializeComponent();
InitializeChart();
}
private void InitializeChart()
{
Steema.TeeChart.Styles.Bar bar1 = new Steema.TeeChart.Styles.Bar(tChart1.Chart);
bar1.Marks.Visible = True;
bar1.FillSampleValues(5);
MessageBox.Show(bar1.Marks.Items.Count.ToString());
}
returnes 0. In that example I'm not accessing index greater than 5 but bar1.Marks.Items.Count is 0.
Re: How to draw a mark near clicked point
Posted: Fri Jul 17, 2009 10:02 am
by narcis
Hi bairog,
Yes, but what I meant is that SeriesMarks.Items is only initialized when you customize a series mark accessing to it. For example, using code below will return Count=3 as 3rd mark is edited and null MarksItems for 0 and 1 are added since they didn't exist before.
Code: Select all
Steema.TeeChart.Styles.Bar bar1 = new Steema.TeeChart.Styles.Bar(tChart1.Chart);
bar1.Marks.Visible = true;
bar1.FillSampleValues(5);
bar1.Marks.Items[2].Color = Color.Red;
MessageBox.Show(bar1.Marks.Items.Count.ToString());